#include<stdio.h>
int main()
{
	int year;
	printf("please enter every year:\n");
	scanf("%d",&year);
	if((year%4==0)&&(year%100!=0)||(year%400==0))	
	{
		printf("%d is a leap year\n",year);
	}
	else
	{
		printf("%d is not a leap year\n",year);
	 } 
	 return 0;
}
